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<div class="titlepage"><div><div><h5 class="title">
<a name="beast.ref.boost__beast__websocket__stream.async_write"></a><a class="link" href="async_write.html" title="websocket::stream::async_write">websocket::stream::async_write</a>
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<p>
          <a class="indexterm" name="idm44861291221600"></a>
        </p>
<p>
          Write a complete message asynchronously.
        </p>
<h6>
<a name="beast.ref.boost__beast__websocket__stream.async_write.h0"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__websocket__stream.async_write.synopsis"></a></span><a class="link" href="async_write.html#beast.ref.boost__beast__websocket__stream.async_write.synopsis">Synopsis</a>
        </h6>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">class</span> <a href="../../../../../../../doc/html/boost_asio/reference/ConstBufferSequence.html" target="_top"><span class="emphasis"><em>ConstBufferSequence</em></span></a><span class="special">,</span>
    <span class="keyword">class</span> <a href="../../../../../../../doc/html/boost_asio/reference/WriteHandler.html" target="_top"><span class="emphasis"><em>WriteHandler</em></span></a> <span class="special">=</span> <span class="identifier">net</span><span class="special">::</span><span class="identifier">default_completion_token_t</span><span class="special">&lt;</span>                <a class="link" href="executor_type.html" title="websocket::stream::executor_type">executor_type</a><span class="special">&gt;&gt;</span>
<a href="../../../../../../../doc/html/boost_asio/reference/asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type" target="_top"><span class="emphasis"><em>DEDUCED</em></span></a>
<span class="identifier">async_write</span><span class="special">(</span>
    <span class="identifier">ConstBufferSequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">buffers</span><span class="special">,</span>
    <span class="identifier">WriteHandler</span><span class="special">&amp;&amp;</span> <span class="identifier">handler</span> <span class="special">=</span> <span class="identifier">net</span><span class="special">::</span><span class="identifier">default_completion_token_t</span><span class="special">&lt;</span> <a class="link" href="executor_type.html" title="websocket::stream::executor_type">executor_type</a> <span class="special">&gt;{});</span>
</pre>
<h6>
<a name="beast.ref.boost__beast__websocket__stream.async_write.h1"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__websocket__stream.async_write.description"></a></span><a class="link" href="async_write.html#beast.ref.boost__beast__websocket__stream.async_write.description">Description</a>
        </h6>
<p>
          This function is used to asynchronously write a complete message. This
          call always returns immediately. The asynchronous operation will continue
          until one of the following conditions is true:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              The complete message is written.
            </li>
<li class="listitem">
              An error occurs.
            </li>
</ul></div>
<p>
          The algorithm, known as a <span class="emphasis"><em>composed asynchronous operation</em></span>,
          is implemented in terms of calls to the next layer's <code class="computeroutput"><span class="identifier">async_write_some</span></code>
          function. The program must ensure that no other calls to <a class="link" href="write.html" title="websocket::stream::write"><code class="computeroutput"><span class="identifier">write</span></code></a>, <a class="link" href="write_some.html" title="websocket::stream::write_some"><code class="computeroutput"><span class="identifier">write_some</span></code></a>, <a class="link" href="async_write.html" title="websocket::stream::async_write"><code class="computeroutput"><span class="identifier">async_write</span></code></a>, or <a class="link" href="async_write_some.html" title="websocket::stream::async_write_some"><code class="computeroutput"><span class="identifier">async_write_some</span></code></a> are performed
          until this operation completes. The current setting of the <a class="link" href="binary.html" title="websocket::stream::binary"><code class="computeroutput"><span class="identifier">binary</span></code></a> option controls whether
          the message opcode is set to text or binary. If the <a class="link" href="auto_fragment.html" title="websocket::stream::auto_fragment"><code class="computeroutput"><span class="identifier">auto_fragment</span></code></a> option is set, the
          message will be split into one or more frames as necessary. The actual
          payload contents sent may be transformed as per the WebSocket protocol
          settings.
        </p>
<h6>
<a name="beast.ref.boost__beast__websocket__stream.async_write.h2"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__websocket__stream.async_write.parameters"></a></span><a class="link" href="async_write.html#beast.ref.boost__beast__websocket__stream.async_write.parameters">Parameters</a>
        </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Name
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<th>
                  <p>
                    Description
                  </p>
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<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">buffers</span></code>
                  </p>
                </td>
<td>
                  <p>
                    A buffer sequence containing the entire message payload. The
                    implementation will make copies of this object as needed, but
                    ownership of the underlying memory is not transferred. The caller
                    is responsible for ensuring that the memory locations pointed
                    to by buffers remains valid until the completion handler is called.
                  </p>
                </td>
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<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">handler</span></code>
                  </p>
                </td>
<td>
                  <p>
                    The completion handler to invoke when the operation completes.
                    The implementation takes ownership of the handler by performing
                    a decay-copy. The equivalent function signature of the handler
                    must be:
                  </p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span>
    <span class="identifier">error_code</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">,</span>           <span class="comment">// Result of operation</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_transferred</span>   <span class="comment">// Number of bytes sent from the</span>
                                    <span class="comment">// buffers. If an error occurred,</span>
                                    <span class="comment">// this will be less than the buffer_size.</span>
<span class="special">);</span>
</pre>
                  <p>
                    Regardless of whether the asynchronous operation completes immediately
                    or not, the handler will not be invoked from within this function.
                    Invocation of the handler will be performed in a manner equivalent
                    to using <code class="computeroutput"><span class="identifier">net</span><span class="special">::</span><span class="identifier">post</span></code>.
                  </p>
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      Falco<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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